[linux-cifs-client] perm error on mount point

[Jeff Layton]

On Wed, 17 Jun 2009 10:35:53 +0200
<pouchat at peewiki.net> wrote:

> 
> 
> Hi, 
> I've a problem with mount.cifs using kernel > 2.6.24 (so with cifs >
> 1.52). With some shares, permission on the mount point
> are not applied.
> 
> Test on debian base distro (kernel 2.6.26-2), when i mount using the
> option dir_mode=0755, the mask is not apply to 
> the mount point but just on the sub-dir. This problem occurs on some
> windows shares (that are automatically 
> made by a external program on my windows 2003 server). 
> 
> With the share "MYSHARE" : error (same error if i don't use dir_mode
> option)
> $> mount -t cifs //192.168.224.1/MYSHARE$ TEST -o
> username=admin,uid=10066,gid=10000,dir_mode=0755 --verbose
> $> ll .
> dr-xr-xr-x 1 admin utilisa._du_domaine 0 jun 11 17:14 TEST
> 
> With other share "OTHERSHARE" : ok (event if i don't use dir_mode option,
> permission are corrects)
> $> mount -t cifs //192.168.224.1/OTHERSHARE$ TEST -o
> username=admin,uid=10066,gid=10000,dir_mode=0755 --verbose
> $> ll .
> drwxr-xr-x 1 admin utilisa._du_domaine 0 jun 11 17:14 TEST
> 
> If i booted from kernel 2.6.24
> with exactly same command, everything works
> as expect for all shares:
> $> mount -t cifs //192.168.224.1/MYSHARE$ TEST -o
> username=admin,uid=10066,gid=10000,dir_mode=0755 --verbose
> $> ll .
> drwxr-xr-x 1 admin utilisa._du_domaine 0 jun 11 17:19 TEST
> 
> I use mount-2.13.1.1-1, smbfs-3.2.5-4lenny2 and samba-common-3.2.5-4lenny2
> 
> So why with kernel 2.6.26 dir_mode is not applied to the mount point on
> some share whereas with 2.6.24 it always works !
> 
> thanks,

It's probably because the server has the ATTR_READONLY bit set on the
directory that corresponds to MYSHARE$. Later versions of CIFS detect
this and clear all of the write bits in the mode when it's present.

-- 
Jeff Layton <jlayton at redhat.com>